摘要
深水悬链锚泊线既为上部浮体运动提供恢复力,同时也提供阻尼力,其中阻尼力主要是由于上部浮体运动牵动悬链锚泊线局部振动和整体运动耗散能量而形成的拖曳粘性阻尼力。利用单根锚泊线由于上部浮体运动而吸收的能量来计算锚泊线的拖曳粘性阻尼。锚泊线和海床之间的接触作用基于刚性海床假定,利用Morrison公式计算锚泊线的惯性力和拖曳力荷载。用有限元方法进行非线性时域动力分析,分别计算静水条件和考虑流速分布两种工况下,上部浮体发生慢漂运动、波频运动以及两者组合运动时的锚泊线动力响应,比较不同工况下锚泊线的最大张力和粘性阻尼。
The restoring forces and the damping forces for the floating platform are all offered by the deepwater eatenary mooring lines. Therein, the damping forces are mainly viscous damping, formed by the dissipated energy of integrated oscillation and the local vibration which was brought about by the oscillation of floating platform. The dissipated energy by a mooring line from the floating platform as a result of its oscillation is applied to calculate the viscous damping of the mooring line. The mooring line and seabed interaction is based on the hypothesis of rigid seabed. The fluid drag force and inertia force on the mooring line are calculated according to the Morrison formula. Respectively under the hydrostatic condition and the current velocity distribution condition, the non-linear dynamic analysis of mooring line is executed in the time-domain based on the finite element method. Bi-harmonic floating platform oscillations which combine wave and drift induced excitation are specified, meanwhile they represent the wave drift oscillation, the wave frequency oscillation and their combination. The maximum tension of mooring line and the viscous damping are obtained.
出处
《海洋工程》
CSCD
北大核心
2009年第4期16-22,共7页
The Ocean Engineering
基金
国家863计划资助项目(2006AA09A103
2006AA09A104)
关键词
深水悬链锚泊线
粘性阻尼
耗散能量
非线性动力分析
deepwater catenary mooring system
viscous damping
dissipated energy
non-liner dynamic analysis